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Thread: Putting elbow in soil stack in Canada

  1. #1
    DIY Junior Member causie's Avatar
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    Default Putting elbow in soil stack in Canada

    I've just torn out gyproc above sink in order to put a sunken medicine cabinet in wall. Unfortunately the soil stack runs right up the middle. Is it OK to put elbow in to make stack run around medicine cabinet?

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    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    It's probably not a "stack". That term is thrown around quite losely. It's probably simply just a vent. If it's just a vent then you can most certainly offset it around the cabinet. And if it's a wet vent extending through more then one story it's called a "soil-or-waste stack wet vent" and there are some rules that come into play when putting offsets in them. But none of these rules would probably apply to you anyway because you're offsetting mabye 2 feet. And you're allowed to offset a vertical wet vent by up to 1.2m for pipe sizes 2 inches and less.

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    DIY Junior Member causie's Avatar
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    Thanks so much for your input. Do you think it's an issue to do it at 90 degrees? This would mean 4 elbows.

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    Moderator & Master Plumber hj's Avatar
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    As long as it is just an air vent, you can use as many elbows as necessary, and offset as far as you have to.

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    DIY Senior Member DavidTu's Avatar
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    Even for the vent, though, if you set it going horiztonal for the offset, it has to be 6" above the lip of the sink before you do so (assuming it is the sink's vent).

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    Forum Admin, Expert Plumber Terry's Avatar
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    This is in Seattle, UPC plumbing code.
    They don't have "soil-or-waste stack wet vents" here.

    If it is indeed a vent, then you can use 45's below 42" or "waste" fittings, not vent 90's
    I don't even buy vent 90's. They cost more and can only be used on vents, whereas medium 90's can be used many more places.

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    DIY Member locus123's Avatar
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    What if it were the actual stack itself? In my kitchen, the stack (which has a tub, sink and toilet feeding into it in the bathroom above), runs on the outside of the 2x6 wall. I was thinking of adding an offset of about the size of the stack (so 3", with 2x45's at the top and 2x45's at the bottom), just to recess it behind the wall. This would avoid having one of those unsightly "boxes" in the middle of the countertop. I would only offset it for the distance between the upper and lower cabinets - I don't mind losing the space in the cabinets.

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    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by locus123 View Post
    What if it were the actual stack itself? In my kitchen, the stack (which has a tub, sink and toilet feeding into it in the bathroom above), runs on the outside of the 2x6 wall. I was thinking of adding an offset of about the size of the stack (so 3", with 2x45's at the top and 2x45's at the bottom), just to recess it behind the wall. This would avoid having one of those unsightly "boxes" in the middle of the countertop. I would only offset it for the distance between the upper and lower cabinets - I don't mind losing the space in the cabinets.
    I think you'll find the answer to this question in my post above.

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